P0A8814 Volt Power Module Current Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0A88 reports that the current sensor of the 14 V power module (DC/DC converter feeding the 12 V system) reads too low while the converter should be delivering power. GM documents it for the Accessory Power Module: in the 2013 eAssist tables the input current must stay below 0.5 A for 1.5 s within a 2 s window while calculated output power is 0.25 to 1.5 kW; the 2016 tables use 0.50 A or less in 640 of 800 samples, enabled only when the APM is on, the hood is closed and the 12 V target is reached. Both rate it Type B, two trips to MIL. A short to ground, an open signal line or a dead sensor are typical; P0A89 is the opposite high fault, P0A87 the plausibility check.
- What you may notice
- MIL and hybrid/charging warning
- 12 V battery not charged properly
- Start/stop function may be disabled
- Likely causes
- LikelySensor signal shorted to ground or open
- PossibleCurrent sensor in the power module failed
- PossibleCorroded or loose module connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.